Welcome to the forum.
Your question is very similar to the one that immediately preceded it. Take a look at my reply there:
http://www.medhelp.org/posts/STDs/How-confident-can-I-be/show/1851295
The bottom line is that oral sex is safe sex -- not completely risk free, but far less likely to result in any STD than unprotected vaginal or anal sex. And you used a condom, meaning you were at truly zero risk. Your lack symptoms at 2 months is further evidence you weren't infected.
It's always a good idea to use condoms in new sexual relationships, unless and until both partners have been tested and known to be free of STDs. On that basis, you and your new partner probably should plan on using condoms, at least initially. But not because of your protected oral sex exposure two months ago.
I hope this has helped. Best wishes-- HHH, MD